Cita APA (7th ed.)

Gray, P. (1961). The Encyclopedia of the biological sciences. Reinhold Publishing Corporation.

Cita Chicago (17th ed.)

Gray, Peter. The Encyclopedia of the Biological Sciences. New York: Reinhold Publishing Corporation, 1961.

Cita MLA (9th ed.)

Gray, Peter. The Encyclopedia of the Biological Sciences. Reinhold Publishing Corporation, 1961.